Filtering of the input module can reduce differential mode interference between the lines of the input signal. In order to reduce the common mode interference between the input signal and the ground, the plc controller should be well grounded. When there is an inductive load at the input, for the AC input signal, the capacitor and the resistor can be connected at both ends of the load. For the DC input signal, the freewheeling diode can be connected in parallel. In order to suppress parasitic capacitance between input signal lines, and induced electromotive force generated by parasitic capacitance or coupling between other lines, an RC surge absorber can be used.
The output is an AC inductive load, and the RC surge absorber can be connected in parallel across the load; if it is a DC load, the freewheeling diode can be connected in parallel, as close as possible to the load. For the case of a digital output, a surge absorber or a thyristor output module can be used. In addition, the use of output point series intermediate relay or photoelectric coupling measures can prevent the PLC controller output point from directly connecting to the electrical control loop, and is completely electrically isolated.
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